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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7dc404bc877a599cbd869d915e0ca6f4b59aba1dd479e164931b6ef1972b378' 
  AND token = 'o20+ZJd7r99GX6xL1c8PDDL+7P2xH86q+4mmH/VIq4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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