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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74eafc6b3d332dbf3f39f0d370faa0a6e861c2f5b140c944c44d5b6aa80ee9e7' 
  AND token = 'P0fS2gxcLB8AxDMisKaex+XlIvDNjr/7ko5zJLKC6r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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