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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b2f26966adf3525d855f064c2114863b32e743a3e8a3b0cd5612de7faea028b' 
  AND token = 'rehWrjNgo1sKuN7Q/QnOwENLnUah2aBhS8nBfKMY7II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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