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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd287a16ccd89fdab768bf1d9d71060bb4da61930cc7f78ce5b3c646cf0fb874f' 
  AND token = 'zT/dEIT/EnjuJ6Eto2V8qeQ4vDUKIlmpLGai3VAgry8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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