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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0da88f25001bb144f0ae9d5e86005d07aa8a3b59fe4c8763ade49960976929fd' 
  AND token = 'OwMgPpXChdfacLN0ht3He5jcqr/FB51BRRkay75l5b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}