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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29ea07c7db49826ba4034b4584ac695e921f99cc8d80d7f8fbf91afb88177421' 
  AND token = 'HJ2ZyGX8artEJ94pEIv6uIku2TxWPoDs6Itxtlmx2nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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