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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac807e29259e1a79667d9691412d9045932b2d194277f607b824344f00314539' 
  AND token = 'f1e8zJ4VjlE27ZP7obRuEdm+yK/ntTahVniQfxFMz3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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