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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83ab071ae950eb1f28924249305cd898af02fe51950e25e24eed1b2ab55d6d72' 
  AND token = 'W5kHIN0lRlPIc7l0euSUQt8dI1Aw880ANJ0W86fsQ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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