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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb19b867fce1b57219ad0502c151f3d5f8f18ff5fbe29cd90bbc085ac1ebfa18' 
  AND token = 'DoKuaoiPKnDdCHhdZkda4uVP8beyBRlJoiVZahuroMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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