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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a51e7a115eb2550a98bedb1ed7204f386157020833177ad2512aede235739e3e' 
  AND token = 'DsKSSPjT86+qvwTfuDa2ugh6p3pDLqOjMUYRS2qNzL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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