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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f42751ef93df949379f587acee893775d3ef83d12edc17a7bdfc5f6d629e308' 
  AND token = 'Stz6bSYMipaQwYaADAomnops4nwAqbQt6nkXD4y2uW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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