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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36a0b585959a72019097be3b9740fe1f6f6d94e7be4374fc5f1d6551530f9af2' 
  AND token = '8Na6eLAMnNB3SqVSfCNI5Yez9kGe7uSCaNf+LpgmmuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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