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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af6e63fdc189eae8e2efeb5df0a2d8b73912d095867fd8a02b670b2f2b4cb8da' 
  AND token = 'Rl5sJS2mly3DfAkfaJbjYKgjppI8y4pQ2V3dnlRQ3Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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