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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d06defb899c30cb96e77493a4d01e84f58b36795a6e1a38d36c4364124f9e4e' 
  AND token = 'Wr27hrf1vGkdcy39PZuOtvWIbuMAX8GfRJNv/04yGV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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