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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6a76c7eab3b7a548a6f270b6dee9fcf18f2c174011cba99348217c46bb89eb7' 
  AND token = '1ySuk7FD1XTTYcpO8stGAizavyRAKJ4dwunLrNZ+ouc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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