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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a31a4c6ee1beb77e51097fa56361fced7c97b480caeee2b06a8bfb773c4916d' 
  AND token = 'wdTjmFM3or4VfCWtTwSgG02l8TQ1AuyulCpVL2DkMRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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