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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f7ee46c258fdcf8f5232f05667b620d88dc8b865407bd79f75ccd9719a63030' 
  AND token = '1m1AnWLk+Ilw/GR7ngWtDQjA962896+jGBW7r35DLFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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