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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46fbf8cb043bf54219aa39dc4c6b992e4c83eed13f7b6e0a9a08b401b4c997ff' 
  AND token = 'tp0fDc0Vvzo7EwdHpXX8+IVVTN71iHYEuYiNiPDX+tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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