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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e6a553e4e45041de5785e1af8edefba3a007382d8cfd0686868293fa303a00a' 
  AND token = 'gZy9oL75xS248ahEASElKyehDXVj+yM+gWq7KeroWc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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