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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d39e70e5596b3c19bee935a147e09245327bd03158dfc76ee4c9757a5cc78c' 
  AND token = 'BPV5+/6T18lzJh/j17sH0cSMA8LVf0VafQcf56pnD/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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