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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f32d8ff7c55c5803ca8bf227045cf279e42c8d0bfa25165e65737f9e5768bbb6' 
  AND token = 'ZhBOARmZkiZnhOuGwc8DFNldIfSnDcr/LMSSS22RWBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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