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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be2c264d6df4c749124b2c0e080aa311384921fbfbe1f94e5185932f5614ff8' 
  AND token = 'NEUdfVlSEhTpNWQ0xdkcHneCl+p1UCvRgGFuegenD70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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