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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc8e3d7377bf3d2d0dba94ee201a521f5fd089adf0d1c8cf52eec3d93fe60ae9' 
  AND token = '6DmQJ+ks6XVerKoEfh+kshJg7MNFlZ1q9XQ5RAYQD9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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