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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67dcd74f91134d856ab77c128d783f3cf57cb76eaf494b18e9534dd92507b9ea' 
  AND token = 'j7QJ5PZXObTW0LE5YRPeT8aiTKM0kmIayPWyI856fhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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