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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cedfaf6c8aed7d075e30efd66fc49695b413321f844988665f4cb1761e12ed1a' 
  AND token = 'tE7RWbF2EUJpPOeD13Z/yWLuz8EesDMO7U7JLDGeviU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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