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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93780c5296ffee50c35b3cdcc4cd77cc6ab1232ad7e86a5dd474ec70af958fd0' 
  AND token = 'kkFdP1y2a39HmJXqMZI/FnR3/KFLaOWYCU3PBDwbEms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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