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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0419dd8ecfd90524c3d49673be28d73b379491f37784fc2e9c89a749a664db8' 
  AND token = '7NBXR+2jAWtBlTN8Tln/grl/Qk9wraSyqAu4bz8ZKy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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