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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b6aa0052e6e91fcb0259f619813942ec2df5317086d0002886f232833efdfb1' 
  AND token = 'qLIB43dlHxQOQ8JmRzoGiAqIw39Qz8BQBmrzMIwr8jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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