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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4270713ee3f00077ecd13cf6cebe67ad1dd3b1c7c5b49d75b5531276d942df7' 
  AND token = 'lczDogPdUWMiQ7NM8M7Xb6y24ZG2bJAsO3A/FvLKMLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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