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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '686b03258d2ce16bac721129bcf2651d209eba3825ab8ad25a235dec2f19dd39' 
  AND token = 'TC2fcuL/75P1IIlaSRSrdPKVgc9heqc9MvHPNx78hCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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