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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '062f645ab1f1b3080ae094a03d14e108826456467197fbfc627214184342fc34' 
  AND token = 'NZFVLK442WvjSBOWNIE5OqL8v28IZObIQIdLu+VVvZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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