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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e6e9ebc0105131610e75c56052e8aab234eba21d789ca57818373c8bca2b796' 
  AND token = '7/KB4CyoOajLOMjxNCBAQPU7OR6zZO11B94JuryOL58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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