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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87c8fa8479e80ed33b3a2e5179217b37070061e2b62e3ccca3db6f6e18162bb5' 
  AND token = 'VYW58O4lk5v4P30odRpRWsXSokuGbflIrkH6JvTI0O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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