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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2bc340164521244b632e0a0ad33ae0a5ab02de3a1303fda0864484abe20f0c1' 
  AND token = '52JZE60XaLh4N23RFXMV0D4wGDNikCF9c+O7JFeZ6uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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