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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '836f2346cc25591f2923a38508f54c3bdc0726324cfefe361e8fe13957f736e5' 
  AND token = 'AoGnksQ8t2jcPfreGAEwNKljC4nhkd96fnfnLlIgLYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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