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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3506e8bc4d9c77375c36ef847de723c11fa47f4d68834aab15cec12682b2ef96' 
  AND token = 'EmTnO8v+8Uhr6L+Bera7Bc4tD0pPB/Rprt4uZd+0R/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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