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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebdcbed9f5245821e17e65f2439163bf6bfc08b2863f177db1895c518b6f0666' 
  AND token = '+CL5rQsHt0Lx5/8SrLdhn+gnQOmAGbdu40p+IKj7OF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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