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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc0aaf08784ee0f0b2053a5c49c43dad5fd4ea2bcfa1e865806a3e422f23c684' 
  AND token = '4pcfsYYNPUUuRakesoZc50KjLWC/3Zo0tetGlSogzmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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