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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36dd3c6c22048ef85c5f526692b1dee629dbdad14b2eefc35d121af5852d3810' 
  AND token = 'vr7ZtQYTQbPxB7+xoYL/1PfxFDRiX+Gi5ZRhbdys3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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