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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90119d0f3c10b3d17046218a2aa8bebd18e3e0dc3002fd30de41fb86d3883ef1' 
  AND token = 'Gq+FnyiLZzeAemBFOvt2f4erzLt/JP8ZkJI862mDCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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