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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9bffaad3ad08907327d5bcd8327e49517a7749b00a154f1fe8e2e84989a991a' 
  AND token = 'VIv45NgNPd5oqRoNRv+NjDG4PXEJc1DycZNeblU4+2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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