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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd80b3e81ba2c040b8a8aab0c8cd952d8acd0653395b71d49ddffc8a0ddef1518' 
  AND token = 'VhlJSpLi6XBM4eKs1SWsDD1QFFN/Md/Oo2fUgTWNO8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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