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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66e79efbb4e836ac58a49b498ef16ed0dbee53b7c5de709c158f8f8126dbbc3c' 
  AND token = 'hDBImPnBEEVF3WkzgL4CfmSgNpBHyV2UhsLV1wSLbEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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