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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd24be55502d2d2a8cda00d7c713677f36d5e2e71e93ad003539bd8679430f30b' 
  AND token = 'F+DDeL92Nv+z9eY37fpuJ/K0uvR982UDnNCiwkqvke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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