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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3c10f9705270f14d6386438e6dfec36ecf71c9a6fe6e95d88049f956c7ab89' 
  AND token = 'MfBQ9+o3K+qbt+NSP82Bph3vQW/ku/PJcCdQrB9DINE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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