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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33c0b23766c9d94239ba7a191b9faa54a199ea9fc7902bdb186621605dca8b0' 
  AND token = 'uRXAXK1P80zrcV70VYlGGuCZqqnMCX0XMknIJi6CRps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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