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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8946c38e67595afc0d52ad2fef73f6e210cb7e98891f1a66761fc74d3d5f308a' 
  AND token = 'zdSw2ZBDXkGI7oSg36Rj12oO5oLO0FaiS2o/o7y5SWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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