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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7165b48da8aa2bbd36dc084418e4cd957e684b32bc90ca114de7ded24bb34b6' 
  AND token = '30/Z18cLvSQjt5O8KOshWIYGLLKHS9iCCXktY0uop1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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