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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '042f0a97ccfad06c4f773200a3b3e1a73d743e035196c67cf3bafcb9b13fcc86' 
  AND token = 'W8+uyn4XerHR1kjti/lduwp8XXDqlG2DIy202XN/R0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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