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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24d460225fa577090a97aba5aa05a73947c501d28ed3a9c2261bbda006083c52' 
  AND token = 'tbYuugf1t7MiJ1uIkhn+zPDE+ydbodbCSStoEZ7BhMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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