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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '067d194468f2f63c1a25c1b59bf4ebd7db7223de85a7d6dd6487f6e3e770e4a3' 
  AND token = 'ewP9q65r5wJLiFibiR4CCOwHLOHDkd204PwAbc9vPDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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