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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9348be05ff248016891f67d4ea5abceba91ffc80d51111e8e7002cf2d93282e3' 
  AND token = '7H4F6EqPc9nl8QR1zQ4py0LA3VfYZnAQToygKUIDM+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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