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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f0faa21efd0a563a14f19a6bf57230754f2c20f361af321842aa36246774aae' 
  AND token = 'exosC6HeKxZNZagR7pfA76p0CM6eKPVE6OWJYgZJNqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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