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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b5e27051b339d81670cac256e877e71cf2e74ef5d9128dacc6dd474f0edb2dc' 
  AND token = 'PhWdm+mpWLsmZwfeVO+AriPou+Ua1WNGj58GNnqiSG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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