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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e0171f761340846365f0e7a67f27fcd6a7418c74ac256ccb9732f312db9fbc' 
  AND token = 'UzscPp+g+SNke6/MvixaegIOlcVLPVHP2Kt7uagA2eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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