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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e4b1cd2b934e5905b90ac40d340d3a6c35387423902558237a2664123a333e5' 
  AND token = 'xSd8c0zG2GeJaZ7XXKyzxcmQWHU0yWJKE5t9l+1TY/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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