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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e90759c25c7943bc2b2285105ad1e3af812d903676643959dcc1d2fc278f0f27' 
  AND token = 'IYmpq6FeLlNUCRiIynVCxdgzUfo0ct89csx8zPNxd+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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