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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf014ca1cfd622170cb93b1186ed30131250c76db14fac837da55ac5ad554c14' 
  AND token = 'wDmTDgfG1wfDFs54PtZIQdlnYuEMKqbnt2Tykqy3zkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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