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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7074c883aaf0d3049a82961e1a9a5a3fe444664d63f7c83d50c6f6bcdaaab39' 
  AND token = 'GSh/K9NOqlRrFE7LEQFj0hrMOH38f6tirspZysg9NZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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