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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e9395b0810317bbe4cac3dfc0b65d5cb6144243a9fe4e90dd6c226b68d98e02' 
  AND token = 'oOZHwRqI64KlZhiHg+PGkbz6otU0Za1S0ZcLRXk8kzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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